SwiftUI Image from Data

Question

I am making a multi-platform SwiftUI app that loads the song artwork from an .mp3 file

let playerItem = AVPlayerItem(url: fileURL)
let metadataList = playerItem.asset.metadata
for item in metadataList {
    guard let key = item.commonKey, let value = item.value else {
        continue
    }

    switch key {
    case .commonKeyArtwork where value is Data :
        let songArtwork = UIImage(data: value as! Data)!
    default:
        continue                    
    }
}

I can also get data by using

let interpretedMP3 = AVAsset(url: fileURL)

and the metadata from that.

This all works fine for ios using UIImage(data: value as! Data)! but macos doesn't support uiimage so how am I supposed to make an image from this data?

you may find it useful to look at this "post" on cross platform image: alfianlosari.com/posts/… It deals with ios and macos images. — workingdog support Ukraine
– workingdog support Ukraine, Commented Jul 24, 2022 at 7:09

Asperi · Accepted Answer · 2022-07-24 06:12:39Z

22

It is possible to make some platform-depedent image builder, like

func createImage(_ value: Data) -> Image {
#if canImport(UIKit)
    let songArtwork: UIImage = UIImage(data: value) ?? UIImage()
    return Image(uiImage: songArtwork)
#elseif canImport(AppKit)
    let songArtwork: NSImage = NSImage(data: value) ?? NSImage()
    return Image(nsImage: songArtwork)
#else
    return Image(systemImage: "some_default")
#endif
}

*Note: actually it can be also used #if os(iOS) etc, but Apple does not recommend to check OS directly until it is really needed explicit platform knowledge, but instead check API like above.

answered Jul 24, 2022 at 6:12

Asperi

262k28 gold badges594 silver badges888 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

jowie Over a year ago

This is a fix, but not ideal since unfortunately there is an issue on image scaling if you convert from UIImage to Image. Apple need to fix this.

Ihor M. · Accepted Answer · 2022-07-24 06:49:29Z

-3

It depends on what you want... But the best way I think is to use the same way implemented before:

extension Image {
    
    init?(data: Data) {
        guard let image = UIImage(data: data) else { return nil }
        self = .init(uiImage: image)
    }
    
}

answered Jul 24, 2022 at 6:49

Ihor M.

3021 silver badge12 bronze badges

3 Comments

Joakim Danielson Over a year ago

There is no UIImage for macOS/AppKit.

Ihor M. Over a year ago

What is the problem with using the same code with NSImage?

Joakim Danielson Over a year ago

That is not what your posted code does and if this is what you mean with your answer it’s not very clear (hence my comment) and maybe you should improve it?

Collectives™ on Stack Overflow

SwiftUI Image from Data

2 Answers 2

1 Comment

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related